Exercise 9. Put the Infinitives into the Past or Present Perfect

1. We weren't hungry. We ( just to have) dinner.

2. Before coming to Siberia Tom (never to see) snow.

3. Helen (already to be) in England for three years but she can't speak English very well.

4. She offered me dinner, but I (to eat) a sandwich, so I wasn't hungry.

5. Today I (to call) Joan three times but I haven't been able to contact her.

6. Your son (to grow) since the last time I saw him.

7. Smoking is a waste of money. I (never to smoke).

8. My father knew Spain so well because he (to visit) the country four times.

9. When I arrived home at seven o'clock, my sister (not to have) dinner yet.

10. I started reading this novel last week but I still (not to finish) it.

11. By the time I got to their house, they (already to leave) home.

12. Her son (to play) chess since he was eleven years old.

13. Before Nick met his wife, he (never to be) in a serious relationship.

15. It is the first time I (to ride) a motorbike. What a great feeling.

Exercise 10. Change the Infinitives into the Past Simple or the Past Continuous (Progressive). Переведите.

Last night, while I (do) my homework, Angela (call). She said she (call) me on her cell phone from her biology classroom at UCLA (University of California at Los Angeles ) . I asked her if she (wait) for class, but she said that the professor was at the front of the hall lecturing while she (talk) to me. I couldn't believe she (make) a phone call during the lecture. I asked what was going on.

She said her biology professor was so boring that several of the students (sleep, actually) in class. Some of the students (talk) about their plans for the weekend and the student next to her (draw) a picture of a horse. When Angela (tell) me she was not satisfied with the class, I (mention) that my biology professor was quite good and (suggest) that she switch to my class.

While we were talking, I (hear) her professor yell, "Miss, are you making a phone call?" Suddenly, the line went dead. I (hang) up the phone and went to the kitchen to make dinner. As I (cut) vegetables for a salad, the phone rang once again. It (be) Angela, but this time she wasn't sitting in class.

Exercise 11. Change the Infinitives into the Past Simple or the Present Perfect. Переведите.

Since computers were first introduced to the public in the early 1980's, technology (change) a great deal. The first computers (be) simple machines designed for basic tasks. They (have, not) much memory and they (be, not) very powerful. Early computers were often quite expensive and customers often (pay) thousands of dollars for machines which actually (do) very little. Most computers (be) separate, individual machines used mostly as expensive typewriters or for playing games.

Times (change) . Computers (become) powerful machines with very practical applications. Programmers (create) a large selection of useful programs which do everything from teaching foreign languages to bookkeeping. We are still playing video games, but today's games (become) faster, more exciting interactive adventures. Many computer users (get, also) on the Internet and (begin) communicating with other computer users around the world. We (start) to create international communities online. In short, the simple, individual machines of the past (evolve) into an international World Wide Web of knowledge.